"States have a positive duty to facilitate and protect the exercise of the right to freedom of peaceful assembly. This duty should be reflected in the legislative framework and relevant law enforcement regulations and practices. It includes a duty to facilitate assemblies at the organizer’s preferred location and within ‘sight and sound’ of the intended audience. The duty to protect also involves the protection of assembly organizers and participants from third party individuals or groups who seek to undermine their right to freedom of peaceful assembly."
OSCE (ODIHR), CoE (Venice Commission): Guidelines on Freedom of Peaceful Assembly (Third Edition), para. 22